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We consider the empiric Pareto principle (20/80 rule) that describes deviation from uniformity for various processes. The principle is applied to the use of electronic journals in a University library. We analyze 2004 usage statistics for periodicals databases (EBSCO, JSTOR, ProQuest and ScienceDirect) as well as combined data for all 4 resources. We plot demand graphs with respect to different titles and conclude that Pareto principle holds true for the use of online periodicals.